Obtained 35 stack frames.
/usr/games/crawl-git-51ab8bf2ec(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x62c3e988e47e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-51ab8bf2ec(_Z20crash_signal_handleri+0x18f) [0x62c3e988e8ef]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x700810842910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x70081089999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x700810842866]: 
/usr/games/crawl-git-51ab8bf2ec(+0x4908fd) [0x62c3e989b8fd]: 
/usr/games/crawl-git-51ab8bf2ec(_Z10die_nolinePKcz+0x16b) [0x62c3e989c19b]: die_noline(char const*, ...)
/usr/games/crawl-git-51ab8bf2ec(_Z20crash_signal_handleri+0x2d0) [0x62c3e988ea30]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x700810842910]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x17d145) [0x70081097d145]: 
/usr/games/crawl-git-51ab8bf2ec(_ZNKSt8_Rb_treeINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt4pairIKS5_15CrawlStoreValueESt10_Select1stIS9_ESt4lessIS5_ESaIS9_EE4findERS7_+0x68) [0x62c3e9e9c738]: std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, CrawlStoreValue>, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, CrawlStoreValue> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, CrawlStoreValue> > >::find(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const
/usr/games/crawl-git-51ab8bf2ec(_ZNK14CrawlHashTable6existsERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x11) [0x62c3e9e99601]: CrawlHashTable::exists(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const
/usr/games/crawl-git-51ab8bf2ec(_Z17artefact_propertyRK8item_def18artefact_prop_type+0x76) [0x62c3e981be96]: artefact_property(item_def const&, artefact_prop_type)
/usr/games/crawl-git-51ab8bf2ec(+0x71a00a) [0x62c3e9b2500a]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xfcfd) [0x700811274cfd]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xe6e9) [0x7008112736e9]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0x228fc) [0x7008112878fc]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0x1a0eb) [0x70081127f0eb]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xae23) [0x70081126fe23]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(lua_resume+0x72) [0x700811272072]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0x21937) [0x700811286937]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0x21a23) [0x700811286a23]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xfcfd) [0x700811274cfd]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0x1a2ba) [0x70081127f2ba]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xe71d) [0x70081127371d]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xae23) [0x70081126fe23]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(+0xd7b0) [0x7008112727b0]: 
/lib/x86_64-linux-gnu/liblua5.1.so.0(lua_pcall+0x5c) [0x7008112728dc]: 
/usr/games/crawl-git-51ab8bf2ec(_ZN4CLua6callfnEPKcii+0xca) [0x62c3e98759aa]: CLua::callfn(char const*, int, int)
/usr/games/crawl-git-51ab8bf2ec(+0xbdce2e) [0x62c3e9fe7e2e]: 
/usr/games/crawl-git-51ab8bf2ec(+0xbdd9b5) [0x62c3e9fe89b5]: 
/usr/games/crawl-git-51ab8bf2ec(main+0x1f7) [0x62c3e97c9397]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7008108280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x700810828189]: 
/usr/games/crawl-git-51ab8bf2ec(_start+0x25) [0x62c3e97c9db5]: